Using Keynote image/audio file in Intro Media in iBA

I've created a Keynote file containing a still image and some audio that I want to use as Intro Media in a book I am creating in iBA. I have exported the Keynote file to Quicktime. Media in iBA tells me I need to prepare the file for sharing in iMovie. However, iMovie refuses to accept it. Apparently, I have to convert the Quicktime file into something else before I can prepare it in iMovie. How do I do this? Or is there an easier way to fuse an image and some audio such that I can drop it into Intro Media?